Thermal circuit-breaker



(No Model.) I

H. KLEIN. THERMAL GIRGUIT BRBAKBR.

l No. 530,430. Patent-ed Deo. 4, 1894.

l I f l of the United States,

, PATENT orion.

HENRY KLEIN, OF JANESVILLE, WISCONSIN.

THERMAL CIRCUIT-BREAKER.

SPECIFICATION forming part of Letters Patent No. 530,430, dated December 4, 1894.

Application filled May 19l 1894. Serial No. 511,818. (No model.)

To all whom it may concern..-

Be it known that I, HENRY KLEIN, a citizen residing at Janesville, in the county of Rock and State of Wisconsin, have invented a new and useful Thermal Circuit-Breaker for Electrical Alarm-Circuits, of which the following is a specification.

This invention relates to thermal circuit breakers for electrical alarm circuits; and it has for its object to provide a new and useful device of this character that is adapted to be arranged or included in any suitable tire alarm circuit, that will provide for giving an alarm when the same is broken at any point, and to this end the present invention contemplates a circuit breaker device that provides for a normally closed circuit and which while extremely simple and inexpensive at the same time is sufficiently sensitive to heat as to provide for quickly opening the circuit and giving an alarm when subjected to the heat of afire, and in this use the device is especially useful in such places as iiour and planing mills.

With these and other objects in view which will readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated and claimed.

In the accompanying drawings: Figure 1 is a plan view of a thermal circuit breaker constructed in accordance with this invention. Fig. 2 is a central longitudinal sectional view of the same showing the springstrip as normally positioned to close the electrical circuit. Fig. 3 is a similar view showing the spring strip as released from the Xed con` tact plate. i

Referring to the accompanying drawings, 1 designates a cleat block made of wood or other suitable insulating material and which is adapted to be secured to a ceiling, wall or other point of attachment where it would be most desirable to position the circuit breaker to provide for the quick operation thereof in the event of the breaking out of fire. The cleat block 1, has secured to the outer face at one end the fixed copper, brass, or other suitable metal contact plate 2, that is fastened in position by means of screws, pins, or other suitable fastening devices 3, and said iixed contact plate 2, is adapted to have passed therethrough the binding post screw 4, a duplicate of which is passed through the other 5 5 end of the cleat block to provide means for securing the block to the wall, ceiling or other point of attachment, and said screws also act in the capacity of binding posts to connect the wire terminals with the fixed metal con-x tact plate 2, and one end of the spring contact strip 5, one end of which is secured fast to one end of the cleat block l, by means of one of the screws 4, and other suitable fastening devices.

By reason of securing one end of the strip 5, fast to one end of the cleat block 1, the other end of said strip will be left free, and the said strip is outwardly bowed from its point of attachment to the cleat block to provide for a normal spring, or tendency to spring, outward away from the fixed contact plate 2, and in addition to the normal outward spring of the strip 5, the same is caused to have a normal tendency to spring length- Wise or longitudinally by reason of securing the free end of the strip to the plate 2, by fusible solder 6, with the strip bowed outwardly so as to abnormally hold the free end secured to the contact plate at a point nearer to the fastened end of the strip, than when the strip is sprung outwardly from the contact plate.

The normal outward and lengthwise spring of the contact strip 5, assists very greatlyin breaking the electrical 'joint or connection with the contact plate 2, so that when heat has commenced to make the solder soft, the spring of the strip 5, will complete the disconnection by causing the strip to break awa from its soldered connection with the plate 2, and thereby open the electrical alarm circuit to provide for giving the necessary alarm.

From the above it will be seen that the device while simple is extremely sensitive, and being very simple in construction with all the parts thereof exposed, the same may be readily dusted oftl at any time to free the solder from dust or dirt whereby the operation of the device may not become impaired.

ICO

ing its free extremity touching the fixed contact plate at a point nearer the fast end of said spring contact strip than the length of the latter, and fusible solder fastening the free extremity of said spring contact strip onto the fixed contact plate at the point of contact, substantially as set forth.

In testimony that I claim the foregoing as my own I have hereto aiiixed my signaturein the presence of two witnesses.

' HENRY KLEIN.

Witnesses:

JAS. A. FATHER, J. C. CARD. 

